DragDropUtilities.java 文件源码

/** Gets right transferable of given nodes (according to given
* drag action) and also converts the transferable.<br>
* Can be called only with correct action constant.
* @return The transferable.
*/
static Transferable getNodeTransferable(Node[] nodes, int dragAction)
throws IOException {
    Transferable[] tArray = new Transferable[nodes.length];

    for (int i = 0; i < nodes.length; i++) {
        if ((dragAction & DnDConstants.ACTION_MOVE) != 0) {
            tArray[i] = nodes[i].clipboardCut();
        } else {
            tArray[i] = nodes[i].drag ();
        }
    }
    Transferable result;
    if (tArray.length == 1) {
        // only one node, so return regular single transferable
        result = tArray[0];
    } else {
        // enclose the transferables into multi transferable
        result = ExternalDragAndDrop.maybeAddExternalFileDnd( new Multi(tArray) );
    }

    Clipboard c = getClipboard();
    if (c instanceof ExClipboard) {
        return ((ExClipboard) c).convert(result);
    } else {
        return result;
    }
}